Understand dirty reads when using ProxySQL

 Recently I had been asked to dig a bit about WHY some user where getting dirty reads when using PXC and ProxySQL. 

While the immediate answer was easy, I had taken that opportunity to dig a bit more and buildup a comparison between different HA solutions. 

 For the ones that cannot wait, the immediate answer is …drum roll, PXC is based on Galera replication, and as I am saying from VERY long time (2011), Galera replication is virtually synchronous. Given that if you are not careful you MAY hit some dirty reads, especially if configured incorrectly. 

 There is nothing really bad here, we just need to know how to handle it right. 

In any case the important thing is to understand some basic concepts. 

Two ways of seeing the world (the theory)

Once more let us talk about data-centric approach and …

MySQL 8.0.18 was just released, and it contains a brand new feature to analyze and understand how queries are executed: EXPLAIN ANALYZE.

What is it?

EXPLAIN ANALYZE is a profiling tool for your queries that will show you where MySQL spends time on your query and why.…

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Loading any large file into MySQL server using the LOAD DATA INFILE is a time consuming process , because it is single threaded and it is a single transaction too. But with modern hardwares system resource is not a bottle neck. At Mydbops we focus on improving the efficiency of process as we value performance more. MySQL introduced the parallel load data operations in its latest minor release MySQL 8.0.17 . I had the curiosity to test this feature and wanted to know, how it can improve the data loading comparing to the existing single threaded method  . Through this blog I am going to  compare the both methods .

Remember you can use the parallel data loading utility only via MySQL Shell .

Internal Work Flow :

This section describes the …

The MySQL Development team is proud to announce a new version of the MySQL Shell with the following major improvements:

• Migration to Python 3
• Built-in thread reports
• Ability to use an external editor
• Ability to execute system commands within the shell
• Admin API Improvements:
  • New options to log all the SQL used on the different operations
  • Support for IPv6 in InnoDB Clusters
  • New function to reset the InnoDB Cluster recovery accounts
• General maintenance and bug fixing

Python 3 Migration Due to the coming end-of-life (EOL) for Python 2.7… Facebook Twitter LinkedIn

MySQL needs an SSL/TLS library. It uses it primarily to encrypt network connections, but also uses its various algorithms and random number generators.

OpenSSL is the golden standard when it comes to cross-platform open source SSL/TLS library that you use from C/C++.…

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This blog post will help you configure a 3-node Percona XtraDB Cluster using a binary tarball on your local machine. Configuration files are auto-generated with mostly default configurations except for port/IP address details. The tool has the handy script to create configuration files and start multiple Percona XtraDB Cluster nodes on the fly, helping you to start PXC quickly without spending time on startup configuration as well as avoid using any virtual environments.  The script is available in the percona-qa github project. Currently, this script supports PXC binary tarball distributions only.

You can download the appropriate tarball package from the Percona-XtraDB-Cluster-8.0 downloads page. Once you have the packages available on your local machine, unpack the …

The MySQL Development Team is very happy to announce a new 8.0 Maintenance Release of InnoDB Cluster – 8.0.18.

In addition to major quality improvements, 8.0.18 brings some very useful features!

This blog post will only cover InnoDB cluster’s frontend and control panel – MySQL Shell and its AdminAPI – Stay tuned for other blog posts covering MySQL Router and Group Replication!…

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The latest MySQL 8.0 release is out. That is MySQL 8.0.18.  We have some new replication enhancements and some work done on replication internals in this release that we would like to highlight and celebrate with our users. Here is a quick summary.…

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The Mysql, MariaDB and Friends Devroom is pleased to announce the committee that will decide on the talks to be presented. Every year we are overwhelmed with submissions and it’s the committee that have the thankless task of deciding on the final selections – last year we had 67 submissions to reduce down to 17 final selections,

This year’s committee members are:

Marco Tusa (Percona)
Kenny Gryp (MySQL)
Vicențiu Ciorbaru (MariaDB Foundation)
Matthias Crauwels (Pythian)
Giuseppe Maxia (Community)
Federico Razzoli (Community)
…

Dear MySQL users,

MySQL Connector/NET 8.0.18 is the first version to support
.Net Core 3.0 and the sixth general availability release
of MySQL Connector/NET to add support for the X DevAPI, which
enables application developers to write code that combines the
strengths of the relational and document models using a modern,
NoSQL-like syntax that does not assume previous experience writing traditional SQL.

To learn more about how to write applications using the X DevAPI, see
http://dev.mysql.com/doc/x-devapi-userguide/en/index.html. For more
information about how the X DevAPI is implemented in Connector/NET, see
http://dev.mysql.com/doc/dev/connector-net.
NuGet packages provide functionality at a …